64638147 has 16 divisors (see below), whose sum is σ = 99371520. Its totient is φ = 36607872.

The previous prime is 64638143. The next prime is 64638157. The reversal of 64638147 is 74183646.

It is not a de Polignac number, because 64638147 - 2² = 64638143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64638143) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11247 + ... + 15992.

It is an arithmetic number, because the mean of its divisors is an integer number (6210720).

Almost surely, 2^64638147 is an apocalyptic number.

64638147 is a deficient number, since it is larger than the sum of its proper divisors (34733373).

64638147 is a wasteful number, since it uses less digits than its factorization.

64638147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27362.

The product of its digits is 96768, while the sum is 39.

The square root of 64638147 is about 8039.7852583262. The cubic root of 64638147 is about 401.3250784871.

The spelling of 64638147 in words is "sixty-four million, six hundred thirty-eight thousand, one hundred forty-seven".